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(No Model.)

R. L. TEED.

BLEVATOR BRAKE.

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UNITED STArns Pati-rur Qrricn..

RALPH L. TEED, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALE TO ALEXANDER MCGUIRE, OF SAME ILACE.

ELEVATORBRKE.

SPECIPICATION forming part of Letters Patent No. 380,465, ated April 3, 1888.

Serial No. 256,833. (No model.)

To (LZZ 107mm, i may concern:

Be it known that I, RALPH L. TEED, a citizen of the United States, and residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Elevator-Brakes, which is fully set forth in the following specification, reference being had to the accompanying drawings, in which- Figure I is an elevation of a mechanisin einbodying my invention; Fig. II, a plan View of the same; Fig. III, a detail sectional view taken on the line 2 2 of Fig II; Fig. IV, a detail front elevation of the slide and its gripping meohanism detached; Fig. V, a detail sectional view taken on theline ll of Fig. II; and Fig. VI a detail sectional view taken on the line 3 3 of' Fig. II.

Like letters refer to like parts in all the figures of the drawings.

My invention relates to e1evator-brakes,and more particularlytothat class of safety-brakes depending' for their operation upon any increase in the speed 'of the elevatorls descent above a given point, so that upon such an in- Grease, no matter from what cause, the descent of the car will be inirnediately and effectually checked.

My present invention is in the nature of au improvement upon the invention set forth in Letters Patent No. 375,396, granted to me December 27, l1887, and has for its object to siniplify and chcapen the construction therein set forth.

To this end niy 'nvention consists in certain novel features, which I will now proceed to describe, and will then particularly point out in the claims.

In the drawings, A represents the top crossbeam of the elevator-car, and B the ways upon which the said car travels. The gripping-levers C and their actuating-rods D are mounted upon the cross-beam A in substantiall y the same manner as in my application hereinbefore referred to, so that their construction and operation need no detailed description here. The sliding rods D, however, are connected to their bearingsd by means of aspline, cl',(shown in dotted lines in Fig. II of the drawings,) or are otherwise constructed and arranged to prevent their rotatiug, while at the sarne time they may move frecly lougitudinally in the said bearings.

E represents a revoluble sleeve mounted in bearings e on the cross-beam A and threaded w internally at its ends to receive the correspondingly-threaded inner ends of the sliding rods D. These threads are right and left threads, so that when the sleeve E is rotated in one direction the rods I) will be thrust outward, and when rotated in the opposite direction the said rods will be drawu inward toward each other. To operate the slecve E, I einpIoy a rope, F, which may be wound directly around the siec-ve, but which is preferably wound upon a drum, F', attached to the sleeve.

G represents a slide to which the free end of the rope F is attached, as shown at f, the

saidslide being mouuted in a suitable bearing,

G', attached to the face of the cross-beam A, in which bearing the said slide is capable of a limited Vertical moveuient. The upper end of the slide G is bifurcated, thus forining two arms, g, uponeach of which there is pivoted a grippinglcver, H. The lower ends of these -levers have arranged between them a spring,

cable I, the construction which I prefer for this purpose being that shown in the drawings, in which there is niounted ou the upper end of each level' a xzripping` cam or eccentric, fi, grooved to fit the rope or cable, as shown in Fig. V, and pivoted ecoentrioally on the lever. The governor rope or Cable I is secured at its ends in any suitable manner at the top and bottoni of the elevator-well, ad passes around the govcrnor-wheel J, and also around an idler, K, mounted on the car. The governor-wheel J is provided with governor-'arrns J', constructed, arranged, and Operating substantially as in niy application hereinbefore referred IOO to, the relative arrangement of the parts being such that the projecting end of the latch his in the path of the said governor -arms When these latter are t-hrnst out.

The operation of the device is as follows: Dnring the travel of the car at an ordinary rate of speed the parts remain in the position shown in the drawings. In case, however, the speed is increased above the point at which the apparatus is set to act-as, for instance, on account of any slipping of the hoistingcable or breakage of the same-the rate of rotation of the governor-Wheel J will be correspondingly increased, and the governor-arms J' Will be thrnst outward sufficiently to come in contact with the projecting end of thelatch h. Upon strikng this latch the grippinglevers H will be disengaged from each other, and their lower ends will be thrnst outward or separated by the spring H'. The outward ends of the levers will thns move inward toward each other and will grip the rope I.) In case the eccentric-wheels 'i are employed, the grip on the rope will be more effective and certain by reason of the said Wheels being rotated by their contact With the rope, and owing to their eccentricity the greater the tendency of rotation imparted to them the tighter will their grip be. The slide G thus becomes connected to the rope I, and this latter being a fixed rope the car will move downward while the slide remains stationary, owing to its connection with the rope. This prodnces a motion of the slide relative to the sleeve E, which, owing to the rope F connecting thetwo, imparts a rotary motion to the said sleeve. The rotation of the sleeve E forces the rods D outward, owing to the screwth readed connection between the two, and this ontward movement of the rods D causes the gripping-levers O to grip the ways B, and

thereby arrest the descent of the car. It will thus be seen that after the apparatus is once set to operate at any given speed, as soon as this speed is reached the brake Will at once become operative and check the descent of the car. w

lt is obvions that various modifications in the details of construction may be made without departing from the principle of my invention, and I therefore do not wish to be understood as limiting myself strictly to the precise details hereinbefore described, and shown in the drawings.

Having thns described my invention, What I claim as new, and desire to secure by Letters Patent, is--l 1. In an elevator-brake, the combination,

with the car and its ways, of the gripping-le-` vers, the rods for Operating said levers, provided with threaded inner ends, the revoluble sleeve correspondingly threaded, the governorwheel andits rope or cable,and a slide mounted on the car, connected to the sleeve to operate the same and provided With gripping devices to grip the governor-rope, said gripping devices being held in an inoperative position by means of a latch arranged in the path of the governor-arnis when these latter are thrust outward, substantially as and for the purposes specified.

2. In an elevator-brake, the combination, with the revoluble sleeve for Operating the way-gripping levers, of the governor-wheel and its rope, and the slide G, provided With gripping-levers H, having eccentric-wheels latch h, and spring H', substantially as and for the purposes specified.

RALPH L. TEED. Witnesses:

W. F. BERNBROEK, I

F. MALLER. 

